Chap 8: Nervous System - CNS III Flashcards
Extends from the foramen magnum to the 2nd
lumbar vertebra
SPINAL CORD
Two enlargements
cervical and lumbar
provide protection to the spinal cord and stability
Vertebral column and the meninges
tapered, lower end of the spinal cord where it
transitions into the cauda equina
Conus medullaris
thin, fibrous extension that anchors the
spinal cord to the coccyx
Filum terminale
bundle of spinal nerve roots that extends
from the conus medullaris
Cauda equina
Bigger than posterior median sulcus
Anterior median fissure
Center of spinal cord
GRAY MATTER
Looks like letter H or a butterfly
GRAY MATTER
Outer layer of spinal cord
WHITE MATTER
Contains myelinated fiber
WHITE MATTER
bundles of axons (white matter)
Tracts
Do not directly control volitional or
movements rather it helps in the fine-tuning
INDIRECT
Pyramidal tract – because they pass
through the pyramids
DIRECT
Muscle tone and skilled
movements, especially of
hands
Lateral corticospinal
Muscle tone and movement
of trunk muscles
Anterior corticospinal
Movement coordination
Rubrospinal
Posture adjustment,
especially during movement
Reticulospinal
Posture and balance
Vestibulospinal
Movement in response to
visual reflexes
Tectospinal
Pain, temperature, light
touch, pressure, tickle and
itch sensations
Spinothalamic
Proprioception, touch, deep
pressure and vibration
Dorsal column
Proprioception to cerebellum
Spinocerebellar (anterior
& posterior)
31 pairs; mixed nerves
SPINAL NERVES
Cervical
(C1-C8)
Thoracic
(T1-T12)
Lumbar
(L1-L5)
Sacral
(S1-S5)
Coccygeal
(1)
Connective tissue coverings of spinal nerves
Epineurium, perineurium and
endoneurium
For every bundle of the spinal
nerve, it is covered with
endoneurium
a bundle of fascicles
Epineurium
Formed by the anterior rami of C1-C5
CERVICAL PLEXUS
To supply a specific limb
Plexuses